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February 6, 2018 17:53
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/* | |
A: Qual o typeof de result? | |
- string | |
- number | |
- object | |
- function | |
B: Qual o resultado do log? | |
- result is not a function | |
- 1 | |
- 2 | |
*/ | |
const myFn = () => { | |
const myNumber = 1 | |
return () => myNumber + 1 | |
} | |
const result = myFn() | |
typeof result // <- A | |
const result2 = result() // <- B | |
//------------------------------------------------------------------------------ | |
/* | |
C: Qual o resultado do log? | |
- Uncaught TypeError: Assignment to constant variable. | |
- 1 | |
- 2 | |
*/ | |
const object1 = {a: 1 } | |
object1.a = 2 | |
console.log(object1.a) // <- C | |
//------------------------------------------------------------------------------ | |
/* | |
D: Qual o resultado do log? | |
- Uncaught TypeError: Assignment to constant variable. | |
- 'olar' | |
- 'comovai' | |
*/ | |
const a = 'olar' | |
let b = a | |
b = 'como vai' | |
console.log(b) // <- D | |
//------------------------------------------------------------------------------ | |
/* | |
E: Qual o resultado do log? | |
- 3 | |
- 1 | |
- 2 | |
*/ | |
const object1 = { a: 1 } | |
const object2 = object1 | |
object2.a = 2 | |
console.log(object1.a) // <- E | |
//------------------------------------------------------------------------------ | |
/* | |
F: Qual o resultado do log? | |
- 3 | |
- 1 | |
- 2 | |
*/ | |
const object1 = { a: 1 } | |
const object2 = { ...object1 } | |
object2.a = 2 | |
console.log(object1.a) // <- F | |
//------------------------------------------------------------------------------ | |
/* | |
G: Qual o resultado do log? | |
- 0 | |
- undefined | |
- 1 | |
H: Qual o resultado do log? | |
- true | |
- false | |
- ReferenceError: object1 is not defined | |
*/ | |
const object1 = { a: [] } | |
const object2 = { ...object1 } | |
object2.a.push('string') | |
console.log(object1.a.length) // <- G | |
console.log(object1.a === object2.a) // <- H |
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